Refrigerating apparatus of the compression type



y 2, 5- R. HINTZE 2,403,220

' REFRIGERATING API:ARATUS OF THE COMPRESSION TYPE Filed Feb. 26, 1941 INVENTOR RwoLF fill/V725 F BY ATTORNEY.

'According to the invention,

' chamber. arranged according to the invention that in automatically the condenser through a control for the production of ice,

Patented July 2, 1946 I REFRIGERATING APPARATUS OF THE COMPRESSION TYPE Rudolf Hintze,

Berlin-Charlottenburg,

Germany;

vested in.the Alien Property Custodian v Application February 26, 1941, Serial No. 380,596 g In Germany January 1 2, 1940 8 Claims. (c1. 62-116) v quirement can be met by employing refrigerants evaporating at low temperatures. On the other hand, the cooling chamber must be cooled by the evaporator, and for cooling purposes low temperatures are unfavorable, since the goods to becooled become dry owing to the low tempera tures.

The object of the present invention is to provide a cabinet refrigerator of the compression type which will meet the two above-mentioned ferent temperatures are employed in the apparatus. A separate evaporator is employed for each of the two refrigerants so that one evaporator may be chiefly employed for the rapid production of ice, whereas the other evaporator is above all designed as a cooler for the storage or cooling The two evaporators are preferably so operation the two refrigerants flow into the respective evaporators. This can be attained by conveying-the liquefied refrigerant from member, at first to the evaporator in which the heavier refrigerant is used and thence through an overflow conduit to the second evaporator for the refrigerant of lower specific gravity. The heavier refrigerant of the refrigerant mixture flowing from the condenser into the evaporator collects in the lower part of the first evaporator vessel, whereas the refrigerant of lower specific gravity floats on the heavier refrigerant and flows into the second evaporator through the overflow conduit. The conduit connecting the two evaporators is preferably designed in the form of a liquid seal to ensure the withdrawal of vapors from each evaporator independently. The evaporator containing the refrigerant evaporating at a lower temperature is so designed that it may be employed whereas the other evaporator is designed in the er. A particularly simple arrangement of the evaporators is obtained by arranging one evaporator within the other in such a manner that the inner evaporator serves to produce ice and the outer as a chamber cooler.

form of a chamber cool-.

Further details of the invention will be .ap-

compression type according to the invention, and

'erant Ill, it floats in the vessel 8 on connection with the accompanying drawing, in which Fig. 1 shows a, refrigerating apparatus of the Fig. 2 is a schematical arrangement of the two evaporators within frigerator cabinet.

Referring to Fig. 1, i denotes the motor-com pressor set. This set forces the refrigerant through a. conduit 2-into an air-cooled condenser 3 where it is liquefied. The liquefied refrigerant then flows through a conduit 4 into a tank 5 housing a float-controlled valve 6. The tank 5 contains a mixture consisting of two refrigerants having different specific gravities; is supplied with the aid of the valve 6 to a collecting vessel or header 8 through a, conduit 1, evaporator conduits 9 being secured to the Vessel 8 in any suitable manner. Since the refrigerant H has a lower specific gravity than the refrigthe surface of the refrigerant It). Connected to the vessel 3 is an overflow conduit l2 leading to a, collecting vessel or header it. The evaporator conduits M are secured to the vessel I3; In operation,'the

the cooling chamber of a rerefrigerant of lower specific gravity passes into the outside atmosphere (+30),

the evaporator l3, M. The middle portion of the conduit I2 is designed in the form of a liquid seal it. The suction conduits I? and I 8 leading to the suction side of the compressor are connected to the vessels 8 and i3.

- The refrigerant of higher specific gravity is employed in the evaporator 8, 9 designed in the form of a chamber cooler. To this end, as shown in Fig. 1, heat-radiating ribs l9 are so arranged as tobe in heat contact with the refrigerant conduits 9. This evaporator 8, 9 contains a refrigerant, for instance. $02, which evaporates at a relatively high temperature. The evaporator l3, M is designed in the form of an ice-producing unit, as indicated schematically in Fig. l by an ice tray 20. A refrigerant, for instance CHsC], evaporating at a comparatively low temperature, is employed in the evaporator l3, I 4.

According to Fig. 2, the evaporators 9 and M are arranged one within manner that the evaporator M, which serves to produceice, is surrounded by the evaporator 9 servingmainly as a chamber cooler. As will be apparent from the temperatures indicated'in Fig. 2, a natural temperature drop is attained due .to the difference in temperature existing between the cooling The mixture the other in such a' the evaporator ll serving for and for supplying the at least the first one of which is second.

' cacao 5 veiling in the evaporatorv 8 serving as a-chamber cooler, and the temperature prevailing in the production of ice.

What is claimed is:

1..A refrigerating appar erant circulating system comprising a compressor, a condenser and two evaporators provided with headers, two refrigerating fluids in said circulating system, one having a higher specific gravity and boiling point than the other,"the latter being adapted to float on the former, a conduit including a control valve connecting said condenser and the header of one of said evaporators, an overflow conduit connecting said header with the header of the second evaporator, separate conduitsconnecting'each of said evaporators with the suction. side of said compressor, the header of the first evaporator serving as a separating means'for separating the two refrigerating fluids heavier one to the first evaporator and the lighter one to "the second evaporator.

2. In a refrigerating apparatus as set forth in claim 1, the saidoverflow conduit/being provided with a trap to form a liquid seal between the two evaporators.

3. Refrigerating apparatus of thecompressor type, having a refrigerant circulation system containing two separable refrigerants, one havinga higher specific gravity and boiling point than the other the latter being adapted to float on the former, comprising a compressor, a condensing means for condensing said refrigerants to obtain a liquid mixture thereof, two evaporators provided with a header, a conduit including a control means connecting said condensing means tothe header of said first evaporator, an overflow conduit connecting the header of said first evaporator with the second of said evaporators, said header acting as a separating means for separating the said refrigerants and supplying, the-heavier one to the firstevaporator and the lighter one to the 4. A refrigerating system asset forth in claim ,3, .in which the control means comprises a float valve for regulating the flow of the refrigerant tus having a refrigeach of said evaporators said compressor, the header of the first 'evapo 4. mixture from the condensing means to the separating header.

6. A refrigerating system as set forth in claim 3, in which the overflow conduit includes a trap to provide a liquid seal between the evaporators.

6. In a refrigerating system as set .forth in claim 3, the evaporators each being connected to the suction side of aid compressor by a separate conduit. p

, 'l. A cabinet refrigerator provided with a refrigerating apparatus ofv the compressor type, having a refrigerant circulating system containing .two separable refrigerants, one having a higher specific gravity and boiling point than the being adapted to float on the other the latter former, comprising a comp essor, a condensing means for condensing said refrigerants to obtain a liquid mixture thereof, two evaporators, at least the first one of which is provided with a header, a conduit including a control means connecting said condensing means to the header of said first evaporator, an overflow conduit connecting the header of said first evaporator with said header acting as a separating refrigerants and supplying first evaporator and the lighter one' to the second, the second of said evaporators being designed for making ice and encompassed within the first.

8. A refrigerating apparatus having a refriger- I ant circulating'system comprising a compressor,

a condenser and two evaporators at least the first one of which is provided with a header,

two separable refrigerating fluids in said circulating system one having a different specific gravity and being adapted to float on the other, a conduit including a float valve connecting said condenser and the header of'said first evaporator, an overflow conduit connecting said header with said second evaporator, separate conduits connecting with the suction side of rator serving as a separating means for separating the two refrigerating fluids and for supplying the heavier one to .the first evaporator and the fighter one to the second evaporator.

' RUDOLF HINIZE.

boiling point than the other and one 

